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https://frontier.innolan.net/github/AmigaExamples.git
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136 lines
2.3 KiB
ArmAsm
136 lines
2.3 KiB
ArmAsm
include "includes.i"
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xref InstallColorPalette
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xref PokeBitplanePointers
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xref Level3InterruptHandler
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xref copperList
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xref copperListAlternate
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xref bitplanesp1
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xref bitplanesp2
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xref bitplanesp3
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byteMap:
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dc.l Entry
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dc.l endCode-byteMap
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Entry:
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move.l #userstack,a7
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lea CUSTOM,a6
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jsr LoadNextImage
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jsr Init
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.mainLoop:
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jsr WaitVerticalBlank
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if 0
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cmp.l #50*5,counter
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bne .updateCounter
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jsr LoadNextImage
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move.l #0,counter
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else
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jsr LoadNextImage
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endif
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.updateCounter:
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add.l #1,counter
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bra .mainLoop
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counter:
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dc.l 0
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Level3InterruptHandler:
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movem.l d0-a6,-(sp)
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lea CUSTOM,a6
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.checkVerticalBlank:
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move.w INTREQR(a6),d0
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and.w #INTF_VERTB,d0
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beq.s .checkCopper
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.verticalBlank:
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move.w #INTF_VERTB,INTREQ(a6) ; clear interrupt bit
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if INTERLACE==1
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btst #VPOSRLOFBIT,VPOSR(a6)
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beq.s .lof
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lea copperListAlternate,a0
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move.l a0,COP1LC(a6)
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bra .done
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.lof:
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lea copperList,a0
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move.l a0,COP1LC(a6)
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.done
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endif ; INTERLACE==1
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.checkCopper:
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move.w INTREQR(a6),d0
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and.w #INTF_COPER,d0
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beq.s .interruptComplete
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.copperInterrupt:
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move.w #INTF_COPER,INTREQ(a6) ; clear interrupt bit
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.interruptComplete:
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movem.l (sp)+,d0-a6
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rte
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PokeBitplanePointers:
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; d0 = frame offset in bytes
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; a0 = BPLP copper list address
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; a1 = bitplanes pointer
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movem.l d0-a6,-(sp)
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add.l d0,a1 ; Offset for odd/even frames
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moveq #SCREEN_BIT_DEPTH-1,d0
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.bitplaneloop:
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move.l a1,d1
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move.w d1,2(a0)
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swap d1
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move.w d1,6(a0)
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lea SCREEN_WIDTH_BYTES(a1),a1
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addq #8,a0
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dbra d0,.bitplaneloop
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movem.l (sp)+,d0-a6
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rts
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if INTERLACE==1
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copperListAlternate:
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;; bitplane pointers must be first else poking addresses will be incorrect
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dc.w BPL1PTL,0
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dc.w BPL1PTH,0
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dc.w BPL2PTL,0
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dc.w BPL2PTH,0
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dc.w BPL3PTL,0
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dc.w BPL3PTH,0
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dc.w BPL4PTL,0
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dc.w BPL4PTH,0
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dc.w BPL5PTL,0
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dc.w BPL5PTH,0
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dc.w BPL6PTL,0
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dc.w BPL6PTH,0
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dc.l $fffffffe
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endif; INTERLACE==1
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copperList:
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;; bitplane pointers must be first else poking addresses will be incorrect
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dc.w BPL1PTL,0
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dc.w BPL1PTH,0
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dc.w BPL2PTL,0
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dc.w BPL2PTH,0
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dc.w BPL3PTL,0
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dc.w BPL3PTH,0
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dc.w BPL4PTL,0
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dc.w BPL4PTH,0
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dc.w BPL5PTL,0
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dc.w BPL5PTH,0
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dc.w BPL6PTL,0
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dc.w BPL6PTH,0
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dc.l $fffffffe
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align 4
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bitplanesp1:
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dc.l endCode
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bitplanesp2:
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dc.l endCode+(512)+IMAGESIZE
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bitplanesp3:
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dc.l endCode+(512*2)+(2*IMAGESIZE)
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